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Sumner enrolled at Lincoln University in Pennsylvania.
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Graduated magna cum laude with special honors in English, Modern Languages, Greek, Latin, and Philosophy.
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Sumner gained a second B.A. degree from Clark University in Worchester, MA.
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Sumner returned to Lincoln University to obtain his M.A. degree and planned to continue to get his PhD.
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Sumner was drafted to fight for the American army in WWI before he could continue his education
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Sumner took his first teaching position at Wilburforce University in Ohio.
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Sumner received his Ph.D. from Clark University.
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During the summer of 1921, Sumner taught at Southern University in Louisiana.
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Sumner took a position as a psychology and philosophy professor in the college department at West Virginia Collegiate Institute (now Virginia State College) in the fall of 1921
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Sumner resigned from Virginia State
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Sumner became the chairmanship of the department of psychology at Howard University where he remained until his death in 1954.